Remove test suite scripts that have long been migrated to separate repos

Signed-off-by: Olaf Kirch <okir@suse.de>
Move shell functions file from selftest/ to suites/ directory

Signed-off-by: Olaf Kirch <okir@suse.de>
Rename selftest/verify-all -> selftest/verify

Signed-off-by: Olaf Kirch <okir@suse.de>
Makefile: add install-test target

Signed-off-by: Olaf Kirch <okir@suse.de>
selftests: use proper test groups with all test scripts

Signed-off-by: Olaf Kirch <okir@suse.de>